package com.chd.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.chd.dto.Result;
import com.chd.dto.UserDTO;
import com.chd.entity.Follow;
import com.chd.mapper.FollowMapper;
import com.chd.service.IFollowService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.chd.service.IUserService;
import com.chd.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

import static com.chd.utils.RedisConstants.FOLLOWS;

@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private IUserService userService;

    @Override
    public Result follow(Long followUserId, Boolean isFollow) {
        Long userId = UserHolder.getUser().getId();
        if (isFollow) {
            Follow follow = new Follow();
            follow.setId(userId);
            follow.setFollowUserId(followUserId);
            if (save(follow)) {
                stringRedisTemplate.opsForSet().add(FOLLOWS + userId, followUserId.toString());
            }
        }else{
            if (remove(new QueryWrapper<Follow>().eq("user_id", userId).eq("follow_user_id", followUserId))){
                stringRedisTemplate.opsForSet().remove(FOLLOWS + userId, followUserId.toString());
            }
        }
        return Result.ok();
    }

    @Override
    public Result isFollow(Long followUserId) {
        Long userId = UserHolder.getUser().getId();
        Integer count = query().eq("user_id", userId).eq("follow_user_id", followUserId).count();
        return Result.ok(count > 0);
    }

    @Override
    public Result followCommons(Long followUserId) {
        Long userId = UserHolder.getUser().getId();
        String key = FOLLOWS + userId;
        String key2 = FOLLOWS + followUserId;
        Set<String> intersect = stringRedisTemplate.opsForSet().intersect(key, key2);
        List<Long> ids = intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        List<UserDTO> userDTOS = userService.listByIds(ids)
                .stream()
                .map(user -> BeanUtil.copyProperties(user, UserDTO.class))
                .collect(Collectors.toList());
        return Result.ok(userDTOS);
    }
}
